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Full text of "Metallurgy Of Cast Iron"

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FIG.   64.SECTION THROUGH PYROMETER.
FIG.  65.TWO  FORMS OF LE CHATELIERe of a slightly varying composition, a heating of the junction of which produces a current of electricity proportioned to the degrees of heat applied. The amount of this current is measured by a suitably calibrated galvanometer, and thus we can read off the heat at any convenient distance rapidly and with a surprising degree of accuracy.